mirror of
https://github.com/QingdaoU/Judger.git
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91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2012-2015 Jun Wu <quark@zju.edu.cn>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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////////////////////////////////////////////////////////////////////////////////
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#define _BSD_SOURCE // readlink
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#include <dlfcn.h>
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#include <stdlib.h> // exit
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#include <string.h> // strstr, memset
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#include <link.h> // ElfW
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#include <errno.h> // EPERM
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#include <unistd.h> // readlink
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#include <seccomp.h>
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#include <stdio.h>
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int syscalls_whitelist[] = {SCMP_SYS(read), SCMP_SYS(write), SCMP_SYS(fstat),
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SCMP_SYS(mmap), SCMP_SYS(mprotect), SCMP_SYS(munmap),
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SCMP_SYS(brk), SCMP_SYS(access), SCMP_SYS(exit_group)};
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typedef int (*main_t)(int, char **, char **);
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#ifndef __unbounded
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# define __unbounded
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#endif
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int __libc_start_main(main_t main, int argc,
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char *__unbounded *__unbounded ubp_av,
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ElfW(auxv_t) *__unbounded auxvec,
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__typeof (main) init,
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void (*fini) (void),
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void (*rtld_fini) (void), void *__unbounded
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stack_end)
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{
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int i;
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ssize_t len;
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void *libc;
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int whitelist_length = sizeof(syscalls_whitelist) / sizeof(int);
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scmp_filter_ctx ctx = NULL;
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int (*libc_start_main)(main_t main,
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int,
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char *__unbounded *__unbounded,
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ElfW(auxv_t) *,
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__typeof (main),
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void (*fini) (void),
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void (*rtld_fini) (void),
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void *__unbounded stack_end);
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// Get __libc_start_main entry point
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libc = dlopen("libc.so.6", RTLD_LOCAL | RTLD_LAZY);
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if (!libc) {
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exit(1);
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}
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libc_start_main = dlsym(libc, "__libc_start_main");
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if (!libc_start_main) {
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exit(2);
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}
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ctx = seccomp_init(SCMP_ACT_KILL);
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if (!ctx) {
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exit(3);
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}
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for(i = 0; i < whitelist_length; i++) {
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if (seccomp_rule_add(ctx, SCMP_ACT_ALLOW, syscalls_whitelist[i], 0)) {
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exit(4);
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}
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}
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if (seccomp_load(ctx)) {
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exit(5);
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}
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seccomp_release(ctx);
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return ((*libc_start_main)(main, argc, ubp_av, auxvec,
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init, fini, rtld_fini, stack_end));
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}
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